alkene

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alkene

(ăl`kēn), any of a group of aliphatic hydrocarbons whose molecules contain one or more carbon-carbon double bonds (see chemical bondchemical bond,
mechanism whereby atoms combine to form molecules. There is a chemical bond between two atoms or groups of atoms when the forces acting between them are strong enough to lead to the formation of an aggregate with sufficient stability to be regarded as an
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). Alkenes with only one double bond have the general formula CnH2n. In the International Union of Pure and Applied Chemistry (IUPAC) system of chemical nomenclature, the name of an alkene is derived from the name of the corresponding alkanealkane
, any of a group of aliphatic hydrocarbons whose molecules contain only single bonds (see chemical bond). Alkanes have the general chemical formula CnH2n+2.
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 by replacing the -ane alkane suffix with -ene and, if necessary, adding a prefix to indicate the location of the double bond in the molecule. The IUPAC name of the simplest alkene, H2C=CH2, is ethene, which is derived from ethane. Propene is related to propane. Two alkenes, 1-butene and 2-butene, are related to butane; these two compounds, which differ in the location of the double bond in their molecules, are structural isomersisomer
, in chemistry, one of two or more compounds having the same molecular formula but different structures (arrangements of atoms in the molecule). Isomerism is the occurrence of such compounds. Isomerism was first recognized by J. J. Berzelius in 1827.
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. In addition to these IUPAC names, many of the alkenes have common names, e.g., ethene is called ethylene and propene propylene. The alkenes as a group are sometimes called the ethylene series. Since the carbon-carbon double bond is sometimes called an olefinic linkage, the alkenes are sometimes called the olefins. Many of the reactions in which alkenes take part involve the cleavage of half the carbon-carbon double bond and subsequent formation of two single bonds, one to each of the adjacent carbon atoms. Such reactions include hydrogenation, with the formation of an alkane, and hydration, with the formation of an alcohol.
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alkene

[′al‚kēn]
(organic chemistry)
One of a class of unsaturated aliphatic hydrocarbons containing one or more carbon-to-carbon double bonds.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

alkene

a. any unsaturated aliphatic hydrocarbon with the general formula CnH2n
b. (as modifier): alkene series
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
In the FTIR spectra of resins comprising a high content of monomers without aromatic carbon-carbon double bonds, the peaks at 1608 and 1582 [cm.sup.-1] have low or nonexistent intensity, decreasing the reliability and reproducibility of DC measurements on these samples.
From the previous discussion, an oxygenated methine, an oxygenated methylene along with the two carbon-carbon double bonds are entirely present in the sphingosine moiety.
As carbon-carbon double bonds are broken, the [[[T.sub.[C=C]]]/[[T.sub.[C=O]]]] quotient increases, i.e., MAPTMS become covalently bonded to PMMA.
Hereafter, the models, and in turn the coupling behavior are determined by the ability of the catalyst to activate hydrogen (parameter b], the carbon-carbon double bonds loading level (q) and the relative capacity (R) between reaction and mass transfer as well as the residence time ([[theta].sub.[tau]] for a CSTR, or integrated time for a PFR), besides the initial operation conditions.
3, for PCL mixed with 5 wt% VTMS, the absorbance at 1600 [cm.sup.-1] was due to carbon-carbon double bonds. After irradiation, no trace of carbon-carbon double bonds was found in the sample, indicating the complete consumption of VTMS via grafting or cross-linking on PPC chain upon irradiation.
In the IR spectrum of the ferrocen- ylchalcone, 1642 ~ 1655 cm-1 was the characteristic absorption peak of carbonyl, 1587 - 1605 cm-1 was the characteristic absorption peak of carbon-carbon double bonds. And the absorption case of the two characteristic absorption peaks was similar to (alpha), b- unsaturated ketone carbonyl and the conjugated carbon-carbon double bonds, so the carbonyl and carbon-carbon double bonds of compounds 3a ~ 3f were conjugated with each other.
has been granted a patent for an aqueous composition useful as an adhesive comprised of at least one halogenated olefin polymer, at least one high-functionality epoxy resin, and at least one diacid-modified resin that is different from the halogenated olefin polymer; wherein the diacid-modified resin is made by reacting one or more resins that contain carbon-carbon double bonds with one or more diacid or diacid-derivative small molecules with carbon-carbon double bonds.
Saturated fat (containing no carbon-carbon double bonds in their structure) are implicated in heart disease but can be repeatedly heated when it comes to frying.
Key statement: A crosslinkable and crosslinked organosilicon polymer which is prepared from a mixture of a reactive polysiloxane resin having both reactive carbon-carbon double bonds and silicone-hydrogen groups, characterized by alternating structures of polycyclic polyene residue and cyclic (or tetrahedral) polysiloxane residue, and either vinyl terminated fluorine-containing polysiloxane or vinyl terminated phenyl-substituted siloxane.
For example, a classification of "R" (as in SBR) indicates the rubber has an unsaturated carbon molecular chain containing carbon-carbon double bonds. If the unsaturation is not present in the chain, or if carbon atoms do not form the chain, another classification applies.